SEG Tariffs and Metering Explained for New PV Users

For first‑time solar PV users in the UK, one of the most practical steps after commissioning your system is registering for the Smart Export Guarantee. The SEG pays you for every kilowatt-hour you export to the grid, as measured by an approved smart meter. While the idea is simple, the details matter: eligibility documents, export MPANs, metering modes, and tariff structures can affect how much you earn and how smoothly you get paid. This guide breaks down the workings of the scheme, the equipment you need, and what to look for when comparing offers from real providers in your area.

Solar: how the Smart Export Guarantee works

SEG is a government framework requiring licensed electricity suppliers above a certain size to offer at least one export tariff. If you generate electricity from solar PV at a domestic property, your export is measured in kilowatt-hours by a smart meter capable of recording export. Payments are based on actual metered export rather than deemed estimates. You can choose a SEG tariff from a different company than the one supplying your import electricity, although some higher rates may be restricted to customers who also take import.

Tariffs fall into two broad types. Fixed‑rate SEG pays a set pence per kilowatt-hour for each unit exported, giving predictable income. Variable or dynamic SEG tracks market conditions and can change during the day, often using half‑hourly prices. New PV users should check contract terms such as payment frequency, minimum contract lengths, caps, and any requirement to remain an import customer. Always confirm whether rates are region‑specific and whether they require a particular smart meter model.

Panel metering: what hardware do you need?

Your installer will typically provide an MCS certificate for the PV array and inverter, notify the Distribution Network Operator under G98 or G99 rules, and fit a generation meter on the DC‑AC side of the system. For SEG, the crucial device is a smart meter that supports export. Most SMETS2 meters, and many enrolled SMETS1 meters, can be configured for import and export, enabling half‑hourly readings. Your chosen SEG supplier may arrange an export MPAN and switch the meter to record export. If your current meter cannot do this, your supplier will usually replace it. Keep your commissioning documents, MCS certificate, DNO notification evidence, and proof of address ready for tariff applications.

Solar installation guide: steps to qualify for SEG

A simple sequence helps first‑time applicants. After installation and commissioning, confirm your MCS certificate and that the DNO has been notified by your installer. Choose a supplier and SEG tariff that fit your usage pattern and appetite for variable rates. Apply for SEG by submitting ID, proof of ownership, MCS certificate, and meter details. If you do not yet have export enabled, your supplier will arrange an engineer visit to set up export on your smart meter and create your export MPAN. Once live, you will receive payments based on exported kilowatt‑hours, usually monthly or quarterly.

Real‑world pricing varies by supplier and product. Here are examples of export offers available in the UK, illustrating how rates and conditions differ. Always check the latest figures and terms before signing up.

Prices, rates, or cost estimates mentioned in this article are based on the latest available information but may change over time. Independent research is advised before making financial decisions.

How you get paid depends on the supplier. Some credit a separate export account; others pay into your bank. Payment cycles are typically monthly or quarterly, based on automated meter reads. Make sure your account shows an active export MPAN, and verify that export reads are appearing. If you change supplier for import or export, confirm that both sides have the correct meter serial number to prevent gaps in readings.

Understanding the balance between self‑consumption and export will help you interpret payments. SEG pays only for surplus sent to the grid. If your household uses 60 percent of your solar generation directly and exports 40 percent, you are paid for the 40 percent. As a rough example, a 3 kW to 3.6 kW PV system might generate around 2,800 to 3,400 kWh per year depending on location and roof orientation. If 1,200 kWh are exported at 15 p/kWh, export earnings would be about £180 for the year. Actual results vary with weather, shading, demand timing, and the tariff selected.

Batteries can change export patterns. Some providers allow SEG on battery‑only exports if the energy originates from renewables, but they may ask for proof that the battery is not charged from the grid before export. Dynamic tariffs that pay more in peak hours can suit homes using a battery to shift solar to evening periods. Check the small print about mixed sources, time‑of‑use import tariffs, and whether your supplier requires half‑hourly metering consent.

New PV users should also consider practicalities. Keep inverter and meter firmware up to date through your installer or supplier. Photograph your commissioning labels and meter screens for records. If your home has a complex supply, such as three‑phase or micro‑inverters, confirm compatibility with your chosen SEG supplier in advance. For local services, ask installers to verify that the smart meter model they plan to leave in situ supports export mode with your preferred supplier.

In summary, SEG rewards measured exports and is straightforward once your documents and metering are in order. Focus on eligibility, smart meter capability, and the tariff structure that matches your household’s usage pattern. With the right setup, your solar panels can reduce bills while earning fair value for the electricity you do not use on site.